Electrical problem
1999 Chevy Suburban V8 Four Wheel Drive Automatic 99000 miles

I just went to replace the fuel pump on my 99 suburban and the connection on the old pump was a metri pack 150 with a purple, white and two black wires but the pump I got (and every other pump I looked at) now comes with a gt280 connect with a gray, black, orange and purple wire. The directions do not say color wire from the existing harness is to be connected to which color wire for the new gt280 harness. Do you know?

Thanks